The most important aspect of learning/ knowledge is that we should keep in touch with study, if we discard our study, soon we will forget what we have learnt so far.
K Mohan @ Moga
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
I have two points to mention in this context.
The time required for becoming an expert in a subject may not be the same for all. An intelligent person may understand the subject very fast and he can interpret the subject very fast. So he may learn very fast and become an expert in a lesser time. At the same time, a below-average person may require more time to understand the subject. After that to develop his understanding further, he may have to put in more efforts and spend more time to become an expert. Probably the time mentioned may be for an average person.
The second point I want to mention is how concentrated you are while reading and how much you are focussing on the subject. Simply going through the lines while thinking about something else may not make you an expert in the subject. More concentration and focus is required to understand the subject and become an experiment.
I conclude that the rule you mentioned doesn't exactly need to be 10000 hours but the constant effort to put forth to succeed. Thank you for sharing information about this rule